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首页> 外文期刊>CERAMICS INTERNATIONAL >Hot corrosion behavior of plasma sprayed 8YSZ-alumina-CNT composite coating in Na2SO4-60% V2O5 molten salt environment
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Hot corrosion behavior of plasma sprayed 8YSZ-alumina-CNT composite coating in Na2SO4-60% V2O5 molten salt environment

机译：在Na2SO4-60％V2O5熔盐环境中喷涂等离子喷涂的热腐蚀行为8€氧化铝-CNT复合涂料

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摘要

Hot corrosion (HC) behavior of air plasma sprayed 8% yttria stabilized zirconia (8YSZ)-alumina (YA) composite thermal barrier coating has been evaluated in the present work. Three variants of YA coatings were produced, two by reinforcing 1%, 3% multiwall carbon nanotube (MCNT) and one coating was obtained without any MCNT reinforcement. The creep strength enhanced ferritic P91 steel was used as substrate material for coating. Na2SO4 and V2O5 salts mixed in 2:3 ratio was applied to the coating and subjected to 800 degrees C for 120 h in an electric furnace. The microstructure and phase characterization of the coating was carried out before and after HC using scanning electron microscope (SEM) and X-ray diffraction (XRD) respectively. Energy dispersive spectroscopy (EDS) integrated with the SEM was used for elemental analysis of the coating. The investigation reveals improved isothermal HC behavior of 1% MCNT reinforced coating. The dominating effect of the HC was recognized as depletion of yttria leading to destabilization of 8YSZ. The formation of YVO4 was the corrosion product containing the depleted Y2O3 of YSZ. The 1% and 3% MCNT reinforced coating exhibited monoclinic phase percentage of around 9% and 34% respectively. Nanoindentation was carried out along the cross-section before and after the isothermal HC. The Youngs modulus after HC increased by 46%, 42%, 12.5% and 38% for 8Y, 8YA, 8YA1C and 8YA3C coating, respectively. Weibull modulus of Youngs modulus of bond coats was used to identify the efficiency of top coat in retarding the infiltration of molten salt. The bond coat of 8YA1C coating exhibited lowest modulus value (m = 8.55) indicated non-uniform infiltration of detrimental species. The 1% MCNT reinforced thermal barrier coating (TBC) system was more resistant to degradation than the conventional 8YSZ and YA composite coatings.
机译：空气等离子体的热腐蚀（HC）行为喷涂8％yTTRIA稳定的氧化锆（8YSZ） - 在本工作中已经评估了复合热阻挡涂层。产生的YA涂层的三种变体，通过增强1％，3％多壁碳纳米管（MCNT）和一种涂层而没有任何MCNT加固。蠕变强度增强的铁素体P91钢用作涂层的基材材料。将Na2SO4和V2O5盐混合在2：3的比例中施加到涂层上，并在电炉中进行800℃持续120小时。使用扫描电子显微镜（SEM）和X射线衍射（XRD）在HC之前和之后进行涂层的微观结构和相位表征。与SEM集成的能量分散光谱（EDS）用于涂层的元素分析。该研究揭示了1％MCNT加筋涂层的改善等温HC行为。 HC的主导效果被认为是yttria的耗尽，导致8毫秒的稳定化。 YVO4的形成是含有含有YSZ耗尽的Y2O3的腐蚀产物。 1％和3％MCNT增强涂层分别显示出约9％和34％的单级相百分比。在等温HC之前和之后的横截面进行纳米indentation。 HC后的杨氏模量分别增加了46％，42％，12.5％和38％，分别为8Y，8YA，8YA1C和8YA3C涂层。使用粘合涂层的幼小模量的Weibull模量用于识别延迟熔融盐的渗透性的顶部涂层的效率。 8YA1C涂层的粘合涂层表现出最低模量值（M = 8.55），表明不均匀的侵入性物种。 1％MCNT加强热阻挡涂层（TBC）系统比传统的8YSZ和YA复合涂层更具耐劣化。

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